TY - GEN A1 - Wagner, Joachim T1 - International Firm Activities and Innovation: Evidence from Knowledge Production Functions for German Firms KW - Export KW - Auslandsinvestition KW - Wissensproduktion KW - Deutschland KW - Exports KW - foreign direct investment KW - knowledge production function KW - Germany Y1 - 2006 UR - http://pub-data.leuphana.de/frontdoor/index/index/docId/406 ER -